Jim
I'm also visually impaired, legally blind, worked in blind workshops, been to the state rehab for the blind, received SSDI until I got a good paying job. (I just didn't feel right sitting at home and drawing a check, but that's a different topic). I can see good enough to get around, but at night forget it. I couldn't see the far sight of my 1911 when I brought it home and started practicing with it. This was a big disappointment.
My visual conditions are congenital. I didn't see anywhere in you posts if yours are, but even if they're not, I'm sure you've learned to adapt. A lot of the posters here don't realize how your other senses take over in situations like this.
As far as not being able to identify the mailman from the pizza guy from a bad guy, I
know the sound of the UPS truck. I know, without seeing the details of the mailman's face, that it's him from the way he walks, or the shape of his truck.
I trust my gut. Big time. I have to rely on my instincts, and I do. I've become so perceptive over the years most of my family and friends ask for my assessment of others. I seem to have acquired a sixth sense sometimes and can spot someone with bad intentions a mile away. That's not to say I haven't been fooled. I have. And I learned.
When it's dark, or if I'm asleep, I have a dog. This is very, very important to me and I depend on her. I know her bark, she knows her job. I can tell by the tone of her barks if she's bored or alarmed, if someone's just passing by or if someone's on the property. I cannot stress enough to you to get a dog. You don't have to get a huge, lumbering pitbull or similar. I have a Welsh Corgi, small and extremely intelligent. She's my eyes and ears, night and day.
I have the 1911. I got some dayglo paint and painted the sights, yellow on the outsides of the fronts, orange on the insides, orange on the far sight. At daytime it's amazing. At dawn or dusk, even better. At night, I use a separate, hand-held LED tactical flashlight, in the Harries position. In this hold, the light of the LED flashlight hits the far sight, lighting it up. I've practiced this hold until it's a natural motion. I keep the flashlight and 1911 at the bedside at night.
I also have a shotgun, nothing fancy, just a Remington 870 with the HD shells. I keep it within a few feet of my side of the bed.
Hope some of this helps. Use every tool you can, get a shotgun and a good dog. My very best, good luck and I'll be pullin' for you.
steve